Supplementary Financial Information - Disaggregation of revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2023	Jan. 31, 2022
Disaggregation of Revenue [Line Items]
Total net revenue	$ 13,828	$ 17,028
Americas
Disaggregation of Revenue [Line Items]
Total net revenue	5,773	6,859
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total net revenue	4,640	5,936
Asia-Pacific and Japan
Disaggregation of Revenue [Line Items]
Total net revenue	$ 3,415	$ 4,233